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9900series_ipstorming

Restricting calls on CME: COR

05/07/2012 By

            Understanding COR lists: In this post I'll show you how to restrict extensions on CME from placing calls to not allowed numbers. CME has a great tool called Class Of Restriction (COR) which allows us to establish a very granular control over the calls made in our CME based telephony system. For this post we will restrict some extensions from placing calls to local numbers except those manually defined for the network administrator. COR … [Read More...]

esquema_red

Man-In-The-Middle. A practical case.

03/12/2012 By

Hi there, Today I am going to show you how insecure our homes and certain enterprises LANs are. The basics of this issue is to perform a Man-In-The-Middle attack, just together with SSL sniffing, so we can just see every encrypted data packet between the origin and its destination. Please note that this is not any user manual for cracking purposes. This is the scenario: The left side of the network is my home LAN. As you can see my router/gateway (in this case a Comtrend HG-536+) connects … [Read More...]

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gns33

My CCIE Homelab

01/29/2012 By

When I started studying my CCIE I didn't know how I was going to practice labs, real equipment, GNS3, vracks, etc. At the end, after making numbers I realised that the cheapest option were GNS3 with … [Read More...]

CCIE

BaseTopology

DHCP Relay and giaddr

02/21/2012 By

In large networks, DHCP Servers are located on remote subnets, sometimes far from where the clients requesting the ip are located. In these cases, relays agents are needed to carry the DHCP Discover … [Read More...]

NETWORKERS

esquema_red

Man-In-The-Middle. A practical case.

03/12/2012 By

Hi there, Today I am going to show you how insecure our homes and certain enterprises LANs are. The basics of this issue is to perform a Man-In-The-Middle attack, just together with SSL sniffing, so … [Read More...]